webservices: Treat empty prefixes as NULL.

dlls/webservices/tests/writer.c

@@ -395,7 +395,7 @@ static void test_WsWriteStartElement(void)
     HRESULT hr;
     WS_XML_WRITER *writer;
     WS_XML_STRING prefix = {1, (BYTE *)"p"}, ns = {2, (BYTE *)"ns"}, ns2 = {3, (BYTE *)"ns2"};
-    WS_XML_STRING localname = {1, (BYTE *)"a"}, localname2 =  {1, (BYTE *)"b"};
+    WS_XML_STRING localname = {1, (BYTE *)"a"}, localname2 =  {1, (BYTE *)"b"}, empty = {0, NULL};
 
     hr = WsCreateWriter( NULL, 0, &writer, NULL );
     ok( hr == S_OK, "got %08x\n", hr );
@@ -469,6 +469,17 @@ static void test_WsWriteStartElement(void)
     ok( hr == S_OK, "got %08x\n", hr );
     check_output( writer, "<p:a xmlns:p=\"ns\"><b xmlns=\"ns2\"/></p:a>", __LINE__ );
 
+    hr = set_output( writer );
+    ok( hr == S_OK, "got %08x\n", hr );
+
+    hr = WsWriteStartElement( writer, &empty, &localname, &empty, NULL );
+    ok( hr == S_OK, "got %08x\n", hr );
+    hr = WsWriteEndStartElement( writer, NULL );
+    ok( hr == S_OK, "got %08x\n", hr );
+    hr = WsWriteEndElement( writer, NULL );
+    ok( hr == S_OK, "got %08x\n", hr );
+    check_output( writer, "<a></a>", __LINE__ );
+
     WsFreeWriter( writer );
 }
 
@@ -476,7 +487,8 @@ static void test_WsWriteStartAttribute(void)
 {
     HRESULT hr;
     WS_XML_WRITER *writer;
-    WS_XML_STRING prefix = {1, (BYTE *)"p"}, localname = {3, (BYTE *)"str"}, ns = {2, (BYTE *)"ns"};
+    WS_XML_STRING prefix = {1, (BYTE *)"p"}, localname = {3, (BYTE *)"str"};
+    WS_XML_STRING localname2 = {3, (BYTE *)"len"}, ns = {2, (BYTE *)"ns"}, empty = {0, NULL};
     WS_XML_UTF8_TEXT text = {{WS_XML_TEXT_TYPE_UTF8}};
 
     hr = WsCreateWriter( NULL, 0, &writer, NULL );
@@ -492,9 +504,7 @@ static void test_WsWriteStartAttribute(void)
     ok( hr == E_INVALIDARG, "got %08x\n", hr );
 
     /* WsWriteStartAttribute doesn't output anything */
-    localname.length = 3;
-    localname.bytes  = (BYTE *)"len";
-    hr = WsWriteStartAttribute( writer, &prefix, &localname, &ns, FALSE, NULL );
+    hr = WsWriteStartAttribute( writer, &prefix, &localname2, &ns, FALSE, NULL );
     ok( hr == S_OK, "got %08x\n", hr );
     check_output( writer, "", __LINE__ );
 
@@ -513,6 +523,21 @@ static void test_WsWriteStartAttribute(void)
     ok( hr == S_OK, "got %08x\n", hr );
     check_output( writer, "<p:str p:len=\"0\" xmlns:p=\"ns\"/>", __LINE__ );
 
+    hr = set_output( writer );
+    ok( hr == S_OK, "got %08x\n", hr );
+
+    hr = WsWriteStartElement( writer, &prefix, &localname, &ns, NULL );
+    ok( hr == S_OK, "got %08x\n", hr );
+
+    hr = WsWriteStartAttribute( writer, &empty, &localname2, &empty, FALSE, NULL );
+    ok( hr == S_OK, "got %08x\n", hr );
+    hr = WsWriteEndAttribute( writer, NULL );
+    ok( hr == S_OK, "got %08x\n", hr );
+
+    hr = WsWriteEndElement( writer, NULL );
+    ok( hr == S_OK, "got %08x\n", hr );
+    check_output( writer, "<p:str len=\"\" xmlns:p=\"ns\"/>", __LINE__ );
+
     WsFreeWriter( writer );
 }
 

dlls/webservices/writer.c

@@ -518,12 +518,12 @@ static HRESULT write_attribute( struct writer *writer, WS_XML_ATTRIBUTE *attr )
     /* ' prefix:attr="value"' */
 
     size = attr->localName->length + 4 /* ' =""' */;
-    if (prefix) size += prefix->length + 1 /* ':' */;
+    if (prefix && prefix->length) size += prefix->length + 1 /* ':' */;
     if (text) size += text->value.length;
     if ((hr = write_grow_buffer( writer, size )) != S_OK) return hr;
 
     write_char( writer, ' ' );
-    if (prefix)
+    if (prefix && prefix->length)
     {
         write_bytes( writer, prefix->bytes, prefix->length );
         write_char( writer, ':' );
@@ -734,11 +734,11 @@ static HRESULT write_startelement( struct writer *writer )
     /* '<prefix:localname prefix:attr="value"... xmlns:prefix="ns"'... */
 
     size = elem->localName->length + 1 /* '<' */;
-    if (elem->prefix) size += elem->prefix->length + 1 /* ':' */;
+    if (elem->prefix && elem->prefix->length) size += elem->prefix->length + 1 /* ':' */;
     if ((hr = write_grow_buffer( writer, size )) != S_OK) return hr;
 
     write_char( writer, '<' );
-    if (elem->prefix)
+    if (elem->prefix && elem->prefix->length)
     {
         write_bytes( writer, elem->prefix->bytes, elem->prefix->length );
         write_char( writer, ':' );
@@ -796,12 +796,12 @@ static HRESULT write_endelement( struct writer *writer, const WS_XML_ELEMENT_NOD
     /* '</prefix:localname>' */
 
     size = elem->localName->length + 3 /* '</>' */;
-    if (elem->prefix) size += elem->prefix->length + 1 /* ':' */;
+    if (elem->prefix && elem->prefix->length) size += elem->prefix->length + 1 /* ':' */;
     if ((hr = write_grow_buffer( writer, size )) != S_OK) return hr;
 
     write_char( writer, '<' );
     write_char( writer, '/' );
-    if (elem->prefix)
+    if (elem->prefix && elem->prefix->length)
     {
         write_bytes( writer, elem->prefix->bytes, elem->prefix->length );
         write_char( writer, ':' );